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Mathematics 9 Online
OpenStudy (minatsukisaya95):

A random variable X has values -1, 0, 1 with probabilities p, q, and r respectively. Find the values of p, q, and r if E(X)=1/4 and E(X^2)=3/4. If X1 and X2 are two independent random variable and each one of it have the same distribution as X. If Y is a random variable where Y = X1 + X2, find the value of E(Y) and Var(Y).

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